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 ###Instrução: Qual é o total de todas as ocorrências de Shot PCT quando o valor de Blank Ends é 8?
 ###Tabelas: CREATE TABLE champions_by_country (champions_by_country_id AUTO_INCREMENT PRIMARY KEY, Country VARCHAR, Amateur Era INT, Open Era INT, All-time INT, First title INT, Last title INT) CREATE TABLE doubles_8–4 (doubles_8–4_id AUTO_INCREMENT PRIMARY KEY, Outcome VARCHAR, Date VARCHAR, Surface VARCHAR, Partner VARCHAR, Opponents in final VARCHAR, Score in final VARCHAR) CREATE TABLE introduction_of_address_classes (introduction_of_address_classes_id AUTO_INCREMENT PRIMARY KEY, Class VARCHAR, Leading bits INT, Size of network number bit field VARCHAR, Size of rest bit field VARCHAR, Number of networks VARCHAR, Addresses per network VARCHAR, Start address VARCHAR, End address VARCHAR) CREATE TABLE round_robin_standings (round_robin_standings_id AUTO_INCREMENT PRIMARY KEY, Locale VARCHAR, Skip VARCHAR, W INT, L INT, PF INT, PA INT, Ends Won INT, Ends Lost INT, Blank Ends INT, Stolen Ends INT, Shot Pct. VARCHAR) CREATE TABLE 4-axle_units (4-axle_units_id AUTO_INCREMENT PRIMARY KEY, Model VARCHAR, Build date VARCHAR, Total produced INT, Wheel arrangement VARCHAR, Prime mover VARCHAR, Power output VARCHAR)  
SELECT COUNT Shot Pct. FROM round_robin_standings WHERE Blank Ends = 8